Soot deposition body manufacturing apparatus and manufacturing method

1. A manufacturing apparatus for manufacturing an optical fiber base material by forming a soot deposition body on a surface of a target rod, comprising:

a pair of holding members that hold both ends of the target rod;

a main burner that generates glass microparticles to be deposited on the target rod while moving in a longitudinal direction of the target rod;

a pair of side burners that are arranged outside a movement range of the main burner and heat both ends of the soot deposition body formed on the surface of the target rod; and

a shielding member that prevents the glass microparticles generated by the main burner from being deposited on the target rod farther outward than a segment of the target rod sandwiched by the pair of side burners such that a flow of a flame of the main burner containing the glass microparticles is restricted from expanding farther outward than the pair of side burners, wherein

the shielding member is provided at a overlapped position with the pair of side burners in the longitudinal direction of the target rod, and

the shielding member is provided at a overlapped position with the pair of side burners in a direction that is perpendicular to the longitudinal direction of the target rod.

2. The manufacturing apparatus according to claim 1 , wherein

the shielding member is fixed to the target rod.

3. The manufacturing apparatus according to claim 1 , wherein

the shielding member is fixed to a chamber housing the target rod.

4. The manufacturing apparatus according to claim 1 , wherein

the shielding member is a plate with a surface expanding in a radial direction of the target rod.

5. The manufacturing apparatus according to claim 4 , wherein

the shielding member includes at least one of a carbon plate and a quartz plate.

6. The manufacturing apparatus according to claim 5 , wherein

the shielding member includes the carbon plate and the quartz plate.

7. A manufacturing method for manufacturing an optical fiber base material by forming a soot deposition body on a surface of a target rod, comprising:

holding both ends of the target rod with a pair of holding members;

depositing glass microparticles on the target rod by moving a main burner that generates the glass microparticles in a longitudinal direction of the target rod; and

heating both ends of the soot deposition body formed on the surface of the target rod with a pair of side burners that are arranged outside a movement range of the main burner, wherein

a shielding member prevents the glass microparticles generated by the main burner from being deposited on the target rod farther outward than a segment of the target rod sandwiched by the pair of side burners such that a flow of a flame of the main burner containing the glass microparticles is restricted from expanding farther outward than the pair of side burners, and

the shielding member is provided at a overlapped position with the pair of side burners in the longitudinal direction of the target rod, and

the shielding member is provided at a overlapped position with the pair of side burners in a direction that is perpendicular to the longitudinal direction of the target rod.

8. A shielding member that is arranged in a manufacturing apparatus, which is for manufacturing optical fiber base material by holding both ends of a target rod with a pair of holding members and forming a soot deposition body on a surface of the target rod, outside of a movement range of a main burner that generates glass microparticles to be deposited on the target rod, and prevents the glass microparticles from being deposited on the target rod farther outward than a segment of the target rod sandwiched by a pair of side burners that heat both ends of the soot deposition body formed on the surface of the target rod such that a flow of a flame of the main burner containing the glass microparticles is restricted from expanding farther outward than the pair of side burners, wherein

the shielding member is provided at a overlapped position with the pair of side burners in the longitudinal direction of the target rod, and

the shielding member is provided at a overlapped position with the pair of side burners in a direction that is perpendicular to the longitudinal direction of the target rod.

9. A manufacturing apparatus for manufacturing an optical fiber base material by forming a soot deposition body on a surface of a target rod, comprising:

a main burner that generates glass microparticles to be deposited on the target rod while moving in a longitudinal direction of the target rod;

a pair of side burners that are arranged outside a movement range of the main burner and heat both ends of the soot deposition body formed on the surface of the target rod; and

a shielding member that prevents the glass microparticles generated by the main burner from being deposited on the target rod farther outward than a segment of the target rod sandwiched by the pair of side burners such that a flow of a flame of the main burner containing the glass microparticles is restricted from expanding farther outward than the pair of side burners, wherein

the shielding member has a first divided plate and a second divided plate.

10. The manufacturing apparatus according to claim 9 , wherein the first divided plate and the second divided plate are coupled via a pair of clamps such that the first divided plate and the second divided plate form a single shielding member with a circular shape.

11. The manufacturing apparatus according to claim 10 , wherein the first divided plate and the second divided plate are semi-circular plates.

12. The manufacturing apparatus according to claim 10 , wherein the second divided plate has a pair of leg portions fixed to a chamber housing the target rod.

13. The manufacturing apparatus according to claim 12 , wherein the first divided plate does not have a pair of leg portions fixed to a chamber housing the target rod.